SELECT 
  COUNT(
    DISTINCT(vi_pages.page_id)
  ) 
FROM 
  vi_pages 
  LEFT JOIN vi_page_descriptions ON vi_pages.page_id = vi_page_descriptions.page_id 
  AND vi_page_descriptions.lang_code = 'en' 
  LEFT JOIN vi_seo_names ON vi_seo_names.object_id = vi_pages.page_id 
  AND vi_seo_names.type = 'a' 
  AND vi_seo_names.dispatch = '' 
  AND vi_seo_names.lang_code = 'en' 
  INNER JOIN vi_ult_objects_sharing ON (
    vi_ult_objects_sharing.share_object_id = vi_pages.page_id 
    AND vi_ult_objects_sharing.share_company_id = 1 
    AND vi_ult_objects_sharing.share_object_type = 'pages'
  ) 
WHERE 
  1 
  AND vi_pages.parent_id IN (7) 
  AND vi_pages.status IN ('A') 
  AND vi_pages.page_type IN ('B') 
  AND (
    vi_pages.usergroup_ids = '' 
    OR FIND_IN_SET(0, vi_pages.usergroup_ids) 
    OR FIND_IN_SET(1, vi_pages.usergroup_ids)
  ) 
  AND (
    vi_pages.use_avail_period = 'N' 
    OR (
      vi_pages.use_avail_period = 'Y' 
      AND vi_pages.avail_from_timestamp <= 1776420288 
      AND (
        vi_pages.avail_till_timestamp >= 1776420288 
        OR vi_pages.avail_till_timestamp = 0
      )
    )
  ) 
ORDER BY 
  vi_pages.timestamp desc

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "vi_pages",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "parent_id"],
          "key": "parent_id",
          "key_length": "3",
          "used_key_parts": ["parent_id"],
          "ref": ["const"],
          "rows": 8,
          "filtered": 100,
          "attached_condition": "vi_pages.`status` = 'A' and vi_pages.page_type = 'B' and (vi_pages.usergroup_ids = '' or find_in_set(0,vi_pages.usergroup_ids) or find_in_set(1,vi_pages.usergroup_ids)) and (vi_pages.use_avail_period = 'N' or vi_pages.use_avail_period = 'Y' and vi_pages.avail_from_timestamp <= 1776420288 and (vi_pages.avail_till_timestamp >= 1776420288 or vi_pages.avail_till_timestamp = 0))"
        }
      },
      {
        "table": {
          "table_name": "vi_seo_names",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "dispatch"],
          "key": "PRIMARY",
          "key_length": "206",
          "used_key_parts": ["object_id", "type", "dispatch", "lang_code"],
          "ref": ["devvipiriscom.vi_pages.page_id", "const", "const", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(vi_seo_names.`type` = 'a' and vi_seo_names.dispatch = '' and vi_seo_names.lang_code = 'en')",
          "using_index": true
        }
      },
      {
        "table": {
          "table_name": "vi_ult_objects_sharing",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "159",
          "used_key_parts": [
            "share_object_id",
            "share_company_id",
            "share_object_type"
          ],
          "ref": ["devvipiriscom.vi_pages.page_id", "const", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "vi_ult_objects_sharing.share_object_id = vi_pages.page_id and vi_ult_objects_sharing.share_object_type = 'pages'",
          "using_index": true
        }
      }
    ]
  }
}