SELECT 
  COUNT(
    DISTINCT(cscart_pages.page_id)
  ) 
FROM 
  cscart_pages 
  LEFT JOIN cscart_page_descriptions ON cscart_pages.page_id = cscart_page_descriptions.page_id 
  AND cscart_page_descriptions.lang_code = 'en' 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = cscart_pages.page_id 
  AND cscart_seo_names.type = 'a' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
  LEFT JOIN cscart_tilda_pages ON cscart_pages.page_id = cscart_tilda_pages.inner_page_id 
WHERE 
  1 
  AND cscart_pages.parent_id IN (28) 
  AND cscart_pages.status IN ('A') 
  AND cscart_pages.company_id IN (
    0, 2, 3, 4, 7, 14, 15, 21, 23, 25, 26, 27, 
    28, 30, 33, 34, 36, 37, 38, 72, 73, 74, 
    78
  ) 
  AND cscart_pages.page_type IN ('B') 
  AND (
    cscart_pages.usergroup_ids = '' 
    OR FIND_IN_SET(0, cscart_pages.usergroup_ids) 
    OR FIND_IN_SET(1, cscart_pages.usergroup_ids)
  ) 
  AND (
    cscart_pages.use_avail_period = 'N' 
    OR (
      cscart_pages.use_avail_period = 'Y' 
      AND cscart_pages.avail_from_timestamp <= 1789886561 
      AND (
        cscart_pages.avail_till_timestamp >= 1789886561 
        OR cscart_pages.avail_till_timestamp = 0
      )
    )
  ) 
ORDER BY 
  cscart_pages.timestamp desc

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.00524233,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_pages",
          "access_type": "ref",
          "possible_keys": ["parent_id"],
          "key": "parent_id",
          "key_length": "3",
          "used_key_parts": ["parent_id"],
          "ref": ["const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.00345856,
          "filtered": 100,
          "attached_condition": "cscart_pages.`status` = 'A' and cscart_pages.company_id in (0,2,3,4,7,14,15,21,23,25,26,27,28,30,33,34,36,37,38,72,73,74,78) and cscart_pages.page_type = 'B' and (cscart_pages.usergroup_ids = '' or find_in_set(0,cscart_pages.usergroup_ids) or find_in_set(1,cscart_pages.usergroup_ids)) and (cscart_pages.use_avail_period = 'N' or cscart_pages.use_avail_period = 'Y' and cscart_pages.avail_from_timestamp <= 1789886561 and (cscart_pages.avail_till_timestamp >= 1789886561 or cscart_pages.avail_till_timestamp = 0))"
        }
      },
      {
        "table": {
          "table_name": "cscart_seo_names",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "dispatch"],
          "key": "PRIMARY",
          "key_length": "206",
          "used_key_parts": ["object_id", "type", "dispatch", "lang_code"],
          "ref": [
            "u428615623_ecartifygonje.cscart_pages.page_id",
            "const",
            "const",
            "const"
          ],
          "loops": 1,
          "rows": 1,
          "cost": 0.00178377,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_seo_names.`type` = 'a' and cscart_seo_names.dispatch = '' and cscart_seo_names.lang_code = 'en')"
        }
      }
    ]
  }
}