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 (
    93353, 93354, 93355, 93750, 93751, 93752, 
    93794, 93848, 93849, 93886, 93887, 
    93888, 93889, 93890, 93891, 93892, 
    93893, 94484, 94486, 94487, 94488, 
    94489, 94490, 94491, 94493, 94494, 
    94496, 94499, 94501, 94505, 94506, 
    94507, 94509, 94511, 94512, 94513, 
    94515, 94516, 94517, 94518, 94519, 
    94520, 94521, 94522, 94523, 94524, 
    94525, 94526
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00118

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 (93353,93354,93355,93750,93751,93752,93794,93848,93849,93886,93887,93888,93889,93890,93891,93892,93893,94484,94486,94487,94488,94489,94490,94491,94493,94494,94496,94499,94501,94505,94506,94507,94509,94511,94512,94513,94515,94516,94517,94518,94519,94520,94521,94522,94523,94524,94525,94526)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}