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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    89325, 86816, 89306, 89324, 89366, 89305, 
    89317, 89307, 89319, 89326, 89312, 
    89318, 89314, 89320, 89315, 89313, 
    89316, 89310, 89311, 89304, 89303, 
    93071, 93072, 93073, 93074, 93075, 
    93076, 93077, 93515, 93516, 93517, 
    93518, 93519, 93520, 93521, 93522, 
    93894, 93895, 94067, 94068, 94069, 
    94070, 94071, 94072, 94703, 94704, 
    96296, 96297
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00093

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (89325,86816,89306,89324,89366,89305,89317,89307,89319,89326,89312,89318,89314,89320,89315,89313,89316,89310,89311,89304,89303,93071,93072,93073,93074,93075,93076,93077,93515,93516,93517,93518,93519,93520,93521,93522,93894,93895,94067,94068,94069,94070,94071,94072,94703,94704,96296,96297)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}