SELECT 
  page_id, 
  location_id, 
  currency_code 
FROM 
  vi_yl_vipiris_page_settings 
WHERE 
  page_id = 50

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "vi_yl_vipiris_page_settings",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "4",
          "used_key_parts": ["page_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}