SELECT 
  cscart_ult_product_descriptions.product_id, 
  cscart_ult_product_descriptions.short_description, 
  IF(
    cscart_ult_product_descriptions.short_description = "", 
    cscart_ult_product_descriptions.full_description, 
    ""
  ) AS full_description, 
  cscart_ult_product_descriptions.meta_keywords, 
  cscart_ult_product_descriptions.meta_description, 
  cscart_ult_product_descriptions.search_words, 
  cscart_ult_product_descriptions.promo_text 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  cscart_ult_product_descriptions.product_id IN (
    39467, 39354, 39353, 39074, 32198, 38513, 
    37790, 38179, 38180, 38181, 39355, 
    35469, 31185, 37632, 34816, 34819, 
    34715, 34718, 34721, 34722, 34727, 
    31105, 31214, 31225, 31068, 31163, 
    31164, 31165, 31179, 31184
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'fr'

Query time 0.00341

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "72.01"
    },
    "table": {
      "table_name": "cscart_ult_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id",
        "company_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code",
        "company_id"
      ],
      "key_length": "13",
      "rows_examined_per_scan": 30,
      "rows_produced_per_join": 30,
      "filtered": "100.00",
      "index_condition": "((`ea201_diorama`.`cscart_ult_product_descriptions`.`company_id` = 1) and (`ea201_diorama`.`cscart_ult_product_descriptions`.`product_id` in (39467,39354,39353,39074,32198,38513,37790,38179,38180,38181,39355,35469,31185,37632,34816,34819,34715,34718,34721,34722,34727,31105,31214,31225,31068,31163,31164,31165,31179,31184)) and (`ea201_diorama`.`cscart_ult_product_descriptions`.`lang_code` = 'fr'))",
      "cost_info": {
        "read_cost": "66.01",
        "eval_cost": "6.00",
        "prefix_cost": "72.01",
        "data_read_per_join": "114K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "company_id",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}