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 = 'ja' 
WHERE 
  1 
  AND cscart_pages.parent_id IN (9) 
  AND cscart_pages.status IN ('A') 
  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 <= 1767178833 
      AND (
        cscart_pages.avail_till_timestamp >= 1767178833 
        OR cscart_pages.avail_till_timestamp = 0
      )
    )
  ) 
ORDER BY 
  cscart_pages.timestamp desc

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "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"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_pages.`status` = 'A' 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 <= 1767178833 and (cscart_pages.avail_till_timestamp >= 1767178833 or cscart_pages.avail_till_timestamp = 0))"
    }
  }
}

Result

COUNT(DISTINCT(cscart_pages.page_id))
0