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 (
    34835, 37789, 39361, 34820, 40466, 40398, 
    40351, 38316, 39325, 40308, 39613, 
    38314, 37788, 36045, 39878, 39611, 
    39354, 39353, 39299, 39300, 39268, 
    38317, 39137, 39138, 39139, 39058, 
    38994, 39313, 37790, 38179
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'fr'

Query time 0.00441

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 (34835,37789,39361,34820,40466,40398,40351,38316,39325,40308,39613,38314,37788,36045,39878,39611,39354,39353,39299,39300,39268,38317,39137,39138,39139,39058,38994,39313,37790,38179)) 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"
      ]
    }
  }
}