SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  cscart_product_descriptions.full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    70125, 31857, 35900, 36611, 36749, 38348, 
    38923, 68327, 70114, 70115, 70116, 
    70117, 70118, 70119, 70120, 70121, 
    70122, 70123, 70124, 70126, 70127, 
    70128, 70129
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "22.07"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id",
        "idx_product_desc_lang",
        "idx_product_name_search",
        "idx_product_desc_sort"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 23,
      "rows_produced_per_join": 23,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "19.77",
        "eval_cost": "2.30",
        "prefix_cost": "22.07",
        "data_read_per_join": "105K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`cscart_db`.`cscart_product_descriptions`.`product_id` in (70125,31857,35900,36611,36749,38348,38923,68327,70114,70115,70116,70117,70118,70119,70120,70121,70122,70123,70124,70126,70127,70128,70129)) and (`cscart_db`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}