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 (
    91749, 91750, 91751, 91752, 91753, 91754, 
    91816, 91817, 91818, 91819, 91820, 
    91821, 91822, 91823, 91824, 91825, 
    91826, 91827, 91828, 91829, 91830, 
    91831, 91832, 91833, 91834, 91835, 
    91708, 91709, 91710, 91711
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00088

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 (91749,91750,91751,91752,91753,91754,91816,91817,91818,91819,91820,91821,91822,91823,91824,91825,91826,91827,91828,91829,91830,91831,91832,91833,91834,91835,91708,91709,91710,91711)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
91708 BC Designs Kurv Curved Countertop Basin 615mm x 360mm - No Waste - Polished White
91709 BC Designs Kurv Curved Countertop Basin 615mm x 360mm - No Waste - Powder Blue
91710 BC Designs Kurv Curved Countertop Basin 615mm x 360mm - No Waste - Light Fawn
91711 BC Designs Kurv Curved Countertop Basin 615mm x 360mm - No Waste - Gunmetal
91749 BC Designs Magnus Square Countertop Basin 525mm x 380mm - No Waste - Khaki Green
91750 BC Designs Magnus Square Countertop Basin 525mm x 380mm - No Waste - Mushroom
91751 BC Designs Magnus Square Countertop Basin 525mm x 380mm - No Waste - Powder Grey
91752 BC Designs Magnus Square Countertop Basin 525mm x 380mm - No Waste - Satin Rose
91753 BC Designs Omnia Basin 530x360mm - No Waste - Polished White
91754 BC Designs Crea Oval Countertop Basin 575mm x 145mm - No Waste - Polished White
91816 BC Designs Bampton/Aurelius Basin 535x390mm - Marble
91817 BC Designs Bampton/Aurelius Basin 535x390mm - Matt White
91818 BC Designs Omnia Basin 530x360mm - Powder Blue
91819 BC Designs Omnia Basin 530x360mm - Light Fawn
91820 BC Designs Omnia Basin 530x360mm - Gun Metal
91821 BC Designs Omnia Basin 530x360mm - Industrial Grey
91822 BC Designs Omnia Basin 530x360mm - Khaki Green
91823 BC Designs Omnia Basin 530x360mm - Mushroom
91824 BC Designs Omnia Basin 530x360mm - Matt White
91825 BC Designs Omnia Basin 530x360mm - Powder Grey
91826 BC Designs Omnia Basin 530x360mm - Satin Rose
91827 BC Designs Crea Basin 575 x 145 - Powder Blue
91828 BC Designs Crea Basin 575 x 145 - Light Fawn
91829 BC Designs Crea Basin 575 x 145 - Gunmetal
91830 BC Designs Crea Basin 575 x 145 - Industrial Grey
91831 BC Designs Crea Basin 575 x 145 - Khaki Green
91832 BC Designs Crea Basin 575 x 145 - Mushroom
91833 BC Designs Crea Basin 575 x 145 - Matt White
91834 BC Designs Crea Basin 575 x 145 - Powder Grey
91835 BC Designs Crea Basin 575 x 145 - Satin Rose