SELECT 
  SQL_CALC_FOUND_ROWS cscart_cp_blog_posts.*, 
  cscart_cp_blog_post_descriptions.*, 
  cscart_cp_blog_authors.name as author_profile, 
  (
    cscart_cp_blog_posts.timestamp + cscart_cp_blog_posts.post_id
  ) as next_ts, 
  (
    SELECT 
      GROUP_CONCAT(
        IF(
          cscart_cp_blog_post_categories.link_type = "M", 
          CONCAT(
            cscart_cp_blog_post_categories.category_id, 
            "M"
          ), 
          cscart_cp_blog_post_categories.category_id
        )
      )
  ) as category_ids 
FROM 
  cscart_cp_blog_posts 
  INNER JOIN cscart_cp_blog_post_categories ON cscart_cp_blog_post_categories.post_id = cscart_cp_blog_posts.post_id 
  INNER JOIN cscart_cp_blog_categories ON cscart_cp_blog_categories.category_id = cscart_cp_blog_post_categories.category_id 
  AND (
    cscart_cp_blog_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_cp_blog_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_cp_blog_categories.usergroup_ids
    )
  ) 
  AND cscart_cp_blog_categories.status IN ('A', 'H') 
  LEFT JOIN cscart_cp_blog_post_descriptions ON cscart_cp_blog_posts.post_id = cscart_cp_blog_post_descriptions.post_id 
  AND cscart_cp_blog_post_descriptions.lang_code = 'ru' 
  LEFT JOIN cscart_cp_blog_authors ON cscart_cp_blog_authors.author_id = cscart_cp_blog_posts.author_id 
WHERE 
  1 
  AND cscart_cp_blog_posts.status IN ('A') 
  AND cscart_cp_blog_categories.company_id = 1 
  AND (
    cscart_cp_blog_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_cp_blog_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_cp_blog_categories.usergroup_ids
    )
  ) 
  AND (
    cscart_cp_blog_posts.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_cp_blog_posts.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_cp_blog_posts.usergroup_ids
    )
  ) 
  AND (
    cscart_cp_blog_posts.use_avail_period = 'N' 
    OR (
      cscart_cp_blog_posts.use_avail_period = 'Y' 
      AND cscart_cp_blog_posts.avail_from_timestamp <= 1771121748 
      AND cscart_cp_blog_posts.avail_till_timestamp >= 1771121748
    )
  ) 
  AND cscart_cp_blog_post_categories.category_id IN (4, 6, 7, 8, 9, 10, 5) 
  AND cscart_cp_blog_posts.timestamp = 1693170000 
GROUP BY 
  cscart_cp_blog_posts.post_id 
ORDER BY 
  cscart_cp_blog_posts.timestamp desc, 
  cscart_cp_blog_posts.post_id desc 
LIMIT 
  0, 12

Query time 0.00093

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_cp_blog_authors",
      "access_type": "system",
      "possible_keys": ["PRIMARY"],
      "rows": 0,
      "filtered": 0,
      "const_row_not_found": true
    },
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_cp_blog_posts.post_id desc",
        "table": {
          "table_name": "cscart_cp_blog_post_categories",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 18,
          "filtered": 100,
          "attached_condition": "cscart_cp_blog_post_categories.category_id in (4,6,7,8,9,10,5)"
        }
      }
    },
    "table": {
      "table_name": "cscart_cp_blog_categories",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["category_id"],
      "ref": ["noframes_kz_new.cscart_cp_blog_post_categories.category_id"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_cp_blog_categories.company_id = 1 and (cscart_cp_blog_categories.usergroup_ids = '' or find_in_set(0,cscart_cp_blog_categories.usergroup_ids) or find_in_set(1,cscart_cp_blog_categories.usergroup_ids)) and (cscart_cp_blog_categories.usergroup_ids = '' or find_in_set(0,cscart_cp_blog_categories.usergroup_ids) or find_in_set(1,cscart_cp_blog_categories.usergroup_ids)) and cscart_cp_blog_categories.`status` in ('A','H')"
    },
    "table": {
      "table_name": "cscart_cp_blog_posts",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY", "status"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["post_id"],
      "ref": ["noframes_kz_new.cscart_cp_blog_post_categories.post_id"],
      "rows": 1,
      "filtered": 94.44444275,
      "attached_condition": "cscart_cp_blog_posts.`timestamp` = 1693170000 and cscart_cp_blog_posts.`status` = 'A' and (cscart_cp_blog_posts.usergroup_ids = '' or find_in_set(0,cscart_cp_blog_posts.usergroup_ids) or find_in_set(1,cscart_cp_blog_posts.usergroup_ids)) and (cscart_cp_blog_posts.use_avail_period = 'N' or cscart_cp_blog_posts.use_avail_period = 'Y' and cscart_cp_blog_posts.avail_from_timestamp <= 1771121748 and cscart_cp_blog_posts.avail_till_timestamp >= 1771121748)"
    },
    "table": {
      "table_name": "cscart_cp_blog_post_descriptions",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["post_id", "lang_code"],
      "ref": ["noframes_kz_new.cscart_cp_blog_post_categories.post_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_cp_blog_post_descriptions.lang_code = 'ru')"
    },
    "subqueries": [
      {
        "expression_cache": {
          "state": "uninitialized",
          "query_block": {
            "select_id": 2,
            "table": {
              "message": "No tables used"
            }
          }
        }
      }
    ]
  }
}