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 (
    91285, 82353, 83086, 83141, 89122, 89161, 
    89371, 89552, 91291, 90095, 90105, 
    90114, 86229, 91287, 82347, 84120, 
    86808, 89736, 89989, 89990, 89991, 
    89992, 86811, 89098, 89593, 89594, 
    89126, 91938, 82330, 82348
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "13.52"
    },
    "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",
      "cost_info": {
        "read_cost": "10.52",
        "eval_cost": "3.00",
        "prefix_cost": "13.52",
        "data_read_per_join": "114K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (91285,82353,83086,83141,89122,89161,89371,89552,91291,90095,90105,90114,86229,91287,82347,84120,86808,89736,89989,89990,89991,89992,86811,89098,89593,89594,89126,91938,82330,82348)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82330 Hudson Reed Tec Pura Twin Thermostatic Shower Valve - Chrome
82347 nuie Victorian Dual Thermostatic Shower Valve - Chrome
82348 nuie Victorian Dual Thermostatic Shower Valve - Chrome
82353 Hudson Reed Multi Option Shower Kits Worth Shower Kit - Chrome
83086 Hudson Reed Art Twin Thermostatic Shower Valve - Chrome
83141 nuie Arvan Triple Thermostatic Valve - Chrome
84120 nuie Binsey Triple Thermostatic Valve - Chrome
86229 Hudson Reed Fixed Shower Heads Ceiling Mounted Head & Arm - Chrome
86808 Hudson Reed Tec Dual Exposed Thermostatic Shower Valve - Chrome
86811 nuie Square Showers Twin Thermostatic Shower Valve - Chrome
89098 nuie Round Showers Twin Thermostatic Shower Valve - Chrome
89122 Hudson Reed Reign Twin Thermostatic Shower Valve - Chrome
89126 Hudson Reed Reign Twin Thermostatic Shower Valve - Chrome
89161 Hudson Reed Round Valves Twin Valve - Chrome
89371 nuie Thermostatic Square Bar Valve & Single Function Slide Rail Shower Kit - Chrome
89552 Hudson Reed Square Valves Twin Valve - Chrome
89593 nuie Shower Heads Round LED Fixed Head - Chrome
89594 nuie Shower Heads Square LED Fixed Head - Chrome
89736 Old London White Topaz Exposed Dual Shower Valve - Chrome / White
89989 nuie Commercial Exposed Sequential Shower Valve - Chrome
89990 nuie Commercial Exposed Sequential Thermostatic Valve - Chrome
89991 nuie Commercial Sequential Thermostatic Shower Valve - Chrome
89992 nuie Commercial Sequential Thermostatic Shower Valve - Chrome
90095 nuie Windon Twin Thermostatic Valve With Diverter - Matt Black
90105 nuie Windon Twin Thermostatic Valve With Diverter - Gunmetal
90114 nuie Windon Twin Thermostatic Valve With Diverter - Brushed Brass
91285 nuie Aztec Triple Thermostatic Concealed Shower Valve - 2 Outlet - Chrome
91287 nuie Aztec Twin Thermostatic Concealed Shower Valve with Diverter - 2 Outlet - Matt Black
91291 nuie Aztec Twin Thermostatic Concealed Shower Valve with Diverter - 2 Outlet - Brushed Brass
91938 BC Designs Victrion Traditional Slide Rail Kit and Handset - Brushed Copper