SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    11268, 11047, 11046, 10916, 10939, 10202, 
    9640, 10139, 10003, 9474, 9530, 9465, 
    9464, 9509, 9461, 9477, 9483, 9484, 
    9485, 9486, 9478, 9479, 9480, 9481, 
    9482, 9476, 9475, 5845, 4486, 3661
  ) 
  AND cscart_product_descriptions.lang_code = 'fr'

Query time 0.00530

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "72.01"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 30,
      "rows_produced_per_join": 30,
      "filtered": "100.00",
      "index_condition": "((`ea201_francemaqu`.`cscart_product_descriptions`.`product_id` in (11268,11047,11046,10916,10939,10202,9640,10139,10003,9474,9530,9465,9464,9509,9461,9477,9483,9484,9485,9486,9478,9479,9480,9481,9482,9476,9475,5845,4486,3661)) and (`ea201_francemaqu`.`cscart_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",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}