SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id 
FROM 
  vi_products as products 
  LEFT JOIN vi_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'es' 
  LEFT JOIN vi_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN vi_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN vi_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN vi_categories ON vi_categories.category_id = products_categories.category_id 
  AND (
    vi_categories.usergroup_ids = '' 
    OR FIND_IN_SET(0, vi_categories.usergroup_ids) 
    OR FIND_IN_SET(1, vi_categories.usergroup_ids)
  ) 
  AND vi_categories.status IN ('A', 'H') 
  AND vi_categories.storefront_id IN (0, 1) 
  LEFT JOIN vi_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'es' 
  LEFT JOIN vi_products_categories AS ab__products_categories ON ab__products_categories.product_id = products.product_id 
WHERE 
  1 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND (
    1 
    AND ab__products_categories.category_id IN (243)
  ) 
GROUP BY 
  product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 20

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "if(NULL is not null,NULL,descr1.product), products.product_id",
      "temporary_table": {
        "filesort": {
          "sort_key": "case when products.parent_product_id <> 0 then products.parent_product_id else products.product_id end",
          "temporary_table": {
            "nested_loop": [
              {
                "table": {
                  "table_name": "companies",
                  "access_type": "system",
                  "possible_keys": ["PRIMARY"],
                  "rows": 1,
                  "filtered": 100
                }
              },
              {
                "table": {
                  "table_name": "shared_descr",
                  "access_type": "system",
                  "possible_keys": ["PRIMARY", "product_id", "company_id"],
                  "rows": 0,
                  "filtered": 0,
                  "const_row_not_found": true
                }
              },
              {
                "table": {
                  "table_name": "ab__products_categories",
                  "access_type": "ref",
                  "possible_keys": ["PRIMARY", "pt"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["category_id"],
                  "ref": ["const"],
                  "rows": 3,
                  "filtered": 100,
                  "using_index": true
                }
              },
              {
                "table": {
                  "table_name": "products",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY", "status"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "ref": ["devvipiriscom.ab__products_categories.product_id"],
                  "rows": 1,
                  "filtered": 94.53125,
                  "attached_condition": "products.company_id = 1 and (products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and products.`status` = 'A'"
                }
              },
              {
                "table": {
                  "table_name": "descr1",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY", "product_id"],
                  "key": "PRIMARY",
                  "key_length": "9",
                  "used_key_parts": ["product_id", "lang_code"],
                  "ref": [
                    "devvipiriscom.ab__products_categories.product_id",
                    "const"
                  ],
                  "rows": 1,
                  "filtered": 100,
                  "attached_condition": "trigcond(descr1.lang_code = 'es')"
                }
              },
              {
                "table": {
                  "table_name": "prices",
                  "access_type": "ref",
                  "possible_keys": [
                    "usergroup",
                    "product_id",
                    "lower_limit",
                    "usergroup_id"
                  ],
                  "key": "usergroup",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "ref": ["devvipiriscom.ab__products_categories.product_id"],
                  "rows": 1,
                  "filtered": 97.32824707,
                  "attached_condition": "prices.lower_limit = 1 and prices.usergroup_id in (0,0,1)",
                  "using_index": true
                }
              },
              {
                "table": {
                  "table_name": "products_categories",
                  "access_type": "ref",
                  "possible_keys": ["PRIMARY", "pt"],
                  "key": "pt",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "ref": ["devvipiriscom.ab__products_categories.product_id"],
                  "rows": 1,
                  "filtered": 100
                }
              },
              {
                "table": {
                  "table_name": "vi_categories",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["category_id"],
                  "ref": ["devvipiriscom.products_categories.category_id"],
                  "rows": 1,
                  "filtered": 100,
                  "attached_condition": "(vi_categories.usergroup_ids = '' or find_in_set(0,vi_categories.usergroup_ids) or find_in_set(1,vi_categories.usergroup_ids)) and vi_categories.`status` in ('A','H') and vi_categories.storefront_id in (0,1)"
                }
              }
            ]
          }
        }
      }
    }
  }
}