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 (
    93422, 93423, 93424, 93425, 93426, 93427, 
    93428, 93429, 93430, 93431, 93432, 
    93433, 93434, 93435, 93436, 93437, 
    93438, 93439, 93440, 93441, 93442, 
    93443, 93444, 93445, 93446, 93447, 
    93448, 93449, 93450, 93451, 93452, 
    93453, 93454, 93455, 93456, 93457, 
    93458, 93459, 93460, 93461, 93462, 
    93463, 93464, 93465, 93466, 93467, 
    93468, 93469
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00059

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 (93422,93423,93424,93425,93426,93427,93428,93429,93430,93431,93432,93433,93434,93435,93436,93437,93438,93439,93440,93441,93442,93443,93444,93445,93446,93447,93448,93449,93450,93451,93452,93453,93454,93455,93456,93457,93458,93459,93460,93461,93462,93463,93464,93465,93466,93467,93468,93469)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}