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 (
    85562, 85542, 85603, 92475, 85547, 85569, 
    91876, 85545, 85568, 85544, 84237, 
    85548, 85558, 93282, 93283, 93284, 
    93285, 93286, 93287, 93288, 93289, 
    93290, 93291, 93294, 93338, 93339, 
    94428, 94452, 94453, 94454, 94455, 
    94456, 94458, 94459, 94460, 94461, 
    94462, 94750, 94751, 94752, 94753, 
    94754, 94755, 94756, 94757, 94758, 
    94759, 94760
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00069

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "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": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "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 (85562,85542,85603,92475,85547,85569,91876,85545,85568,85544,84237,85548,85558,93282,93283,93284,93285,93286,93287,93288,93289,93290,93291,93294,93338,93339,94428,94452,94453,94454,94455,94456,94458,94459,94460,94461,94462,94750,94751,94752,94753,94754,94755,94756,94757,94758,94759,94760)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}