SELECT 
  cscart_aprilpages.*, 
  cscart_aprilpage_descriptions.page, 
  cscart_aprilseo_names.name as seo_name, 
  cscart_aprilseo_names.path as seo_path 
FROM 
  cscart_aprilpages 
  LEFT JOIN cscart_aprilpage_descriptions ON cscart_aprilpages.page_id = cscart_aprilpage_descriptions.page_id 
  AND cscart_aprilpage_descriptions.lang_code = 'ru' 
  LEFT JOIN cscart_aprilseo_names ON cscart_aprilseo_names.object_id = cscart_aprilpages.page_id 
  AND cscart_aprilseo_names.type = 'a' 
  AND cscart_aprilseo_names.dispatch = '' 
  AND cscart_aprilseo_names.lang_code = 'en' 
WHERE 
  1 
  AND cscart_aprilpages.parent_id IN (7) 
  AND cscart_aprilpages.status IN ('A') 
  AND cscart_aprilpages.page_type IN ('B') 
  AND (
    cscart_aprilpages.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_aprilpages.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_aprilpages.usergroup_ids
    )
  ) 
  AND (
    cscart_aprilpages.use_avail_period = 'N' 
    OR (
      cscart_aprilpages.use_avail_period = 'Y' 
      AND cscart_aprilpages.avail_from_timestamp <= 1777123708 
      AND (
        cscart_aprilpages.avail_till_timestamp >= 1777123708 
        OR cscart_aprilpages.avail_till_timestamp = 0
      )
    )
  ) 
ORDER BY 
  cscart_aprilpages.timestamp desc 
LIMIT 
  0, 3

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "3.17"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_aprilpages",
            "access_type": "ref",
            "possible_keys": [
              "parent_id"
            ],
            "key": "parent_id",
            "used_key_parts": [
              "parent_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 3,
            "rows_produced_per_join": 0,
            "filtered": "4.76",
            "index_condition": "(`vishalecarter_april_setup`.`cscart_aprilpages`.`parent_id` <=> 7)",
            "cost_info": {
              "read_cost": "2.10",
              "eval_cost": "0.03",
              "prefix_cost": "2.70",
              "data_read_per_join": "362"
            },
            "used_columns": [
              "page_id",
              "company_id",
              "parent_id",
              "id_path",
              "status",
              "page_type",
              "position",
              "timestamp",
              "usergroup_ids",
              "localization",
              "new_window",
              "use_avail_period",
              "avail_from_timestamp",
              "avail_till_timestamp",
              "facebook_obj_type"
            ],
            "attached_condition": "((`vishalecarter_april_setup`.`cscart_aprilpages`.`status` = 'A') and (`vishalecarter_april_setup`.`cscart_aprilpages`.`page_type` = 'B') and ((`vishalecarter_april_setup`.`cscart_aprilpages`.`usergroup_ids` = '') or find_in_set(0,`vishalecarter_april_setup`.`cscart_aprilpages`.`usergroup_ids`) or find_in_set(1,`vishalecarter_april_setup`.`cscart_aprilpages`.`usergroup_ids`)) and ((`vishalecarter_april_setup`.`cscart_aprilpages`.`use_avail_period` = 'N') or ((`vishalecarter_april_setup`.`cscart_aprilpages`.`use_avail_period` = 'Y') and (`vishalecarter_april_setup`.`cscart_aprilpages`.`avail_from_timestamp` <= 1777123708) and ((`vishalecarter_april_setup`.`cscart_aprilpages`.`avail_till_timestamp` >= 1777123708) or (`vishalecarter_april_setup`.`cscart_aprilpages`.`avail_till_timestamp` = 0)))))"
          }
        },
        {
          "table": {
            "table_name": "cscart_aprilpage_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "page_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "vishalecarter_april_setup.cscart_aprilpages.page_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.14",
              "eval_cost": "0.03",
              "prefix_cost": "2.87",
              "data_read_per_join": "552"
            },
            "used_columns": [
              "page_id",
              "lang_code",
              "page"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_aprilseo_names",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "dispatch"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "type",
              "dispatch",
              "lang_code"
            ],
            "key_length": "206",
            "ref": [
              "vishalecarter_april_setup.cscart_aprilpages.page_id",
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.27",
              "eval_cost": "0.03",
              "prefix_cost": "3.17",
              "data_read_per_join": "248"
            },
            "used_columns": [
              "name",
              "object_id",
              "type",
              "dispatch",
              "path",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}