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 (
    91287, 82347, 84120, 86808, 89736, 89989, 
    89990, 89991, 89992, 86811, 89098, 
    89126, 82330, 82348, 86807, 86846, 
    89732, 83117, 83127, 83136, 90122, 
    91292, 90094, 90104, 90113, 89201, 
    91288, 83116, 83126, 83135
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00080

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 (91287,82347,84120,86808,89736,89989,89990,89991,89992,86811,89098,89126,82330,82348,86807,86846,89732,83117,83127,83136,90122,91292,90094,90104,90113,89201,91288,83116,83126,83135)) 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
83116 nuie Arvan Twin Thermostatic Valve - Matt Black
83117 nuie Arvan Twin Thermostatic Valve With Diverter - Matt Black
83126 nuie Arvan Twin Thermostatic Valve - Gunmetal
83127 nuie Arvan Twin Thermostatic Valve With Diverter - Gunmetal
83135 nuie Arvan Twin Thermostatic Valve - Brushed Brass
83136 nuie Arvan Twin Thermostatic Valve With Diverter - Brushed Brass
84120 nuie Binsey Triple Thermostatic Valve - Chrome
86807 Hudson Reed Tec Dual Concealed Thermostatic Shower Valve - Chrome
86808 Hudson Reed Tec Dual Exposed Thermostatic Shower Valve - Chrome
86811 nuie Square Showers Twin Thermostatic Shower Valve - Chrome
86846 Hudson Reed Tec Crosshead Twin Thermostatic Shower Valve - Chrome
89098 nuie Round Showers Twin Thermostatic Shower Valve - Chrome
89126 Hudson Reed Reign Twin Thermostatic Shower Valve - Chrome
89201 nuie Sanford Twin Thermostatic Valve With Diverter - Chrome
89732 Old London White Topaz Concealed Dual Shower Valve - Chrome / White
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
90094 nuie Windon Twin Thermostatic Valve - Matt Black
90104 nuie Windon Twin Thermostatic Valve - Gunmetal
90113 nuie Windon Twin Thermostatic Valve - Brushed Brass
90122 nuie Windon Twin Thermostatic Valve With Diverter - Chrome
91287 nuie Aztec Twin Thermostatic Concealed Shower Valve with Diverter - 2 Outlet - Matt Black
91288 nuie Aztec Twin Thermostatic Concealed Shower Valve - 1 Outlet - Matt Black
91292 nuie Aztec Twin Thermostatic Concealed Shower Valve - 1 Outlet - Brushed Brass