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 (
    83397, 83407, 86140, 86163, 86648, 86717, 
    83448, 83453, 89760, 89761, 89811, 
    89863, 89935, 91501, 85299, 85396, 
    85447, 85498, 85328, 85329, 85425, 
    85426, 85476, 85477, 85527, 85528, 
    85090, 85176, 85222, 85268, 85345, 
    83066, 83067, 83619, 83620, 89775, 
    90902, 90903, 90981, 90982, 82611, 
    85374, 85375, 82638, 83535, 85130, 
    89814, 89866
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00109

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 (83397,83407,86140,86163,86648,86717,83448,83453,89760,89761,89811,89863,89935,91501,85299,85396,85447,85498,85328,85329,85425,85426,85476,85477,85527,85528,85090,85176,85222,85268,85345,83066,83067,83619,83620,89775,90902,90903,90981,90982,82611,85374,85375,82638,83535,85130,89814,89866)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82611 nuie Arno 1200mm Wall Hung 4-Door Vanity & Worktop - Gloss White
82638 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Worktop - Gloss White
83066 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Laminate Top - Satin Green
83067 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Laminate Top - Satin Green
83397 nuie Athena Wall Hung 2 Drawer Vanity With Grey Worktop 600mm - Anthracite Woodgrain
83407 nuie Athena Wall Hung 2 Drawer Vanity With Grey Worktop 600mm - Hacienda Black
83448 nuie Athena Floor Standing 2 Drawer Vanity With Worktop 800mm - Anthracite Woodgrain
83453 nuie Athena Floor Standing 2 Drawer Vanity With Worktop 800mm - Hacienda Black
83535 nuie Athena Wall Hung 2 Drawer Vanity With Worktop 800mm - Gloss White
83619 nuie Athena Wall Hung Single Drawer Vanity With Sparkling Black Worktop 800mm - Gloss Grey
83620 nuie Athena Wall Hung Single Drawer Vanity With Sparkling White Worktop 800mm - Gloss Grey
85090 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Laminate Top - Satin Anthracite
85130 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Laminate Top - Satin White
85176 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Laminate Top - Satin Grey
85222 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Laminate Top - Satin Blue
85268 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Laminate Top - Satin Green
85299 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin Anthracite
85328 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Anthracite
85329 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Anthracite
85345 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin White
85374 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin White
85375 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin White
85396 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin Grey
85425 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Grey
85426 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Grey
85447 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin Blue
85476 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Blue
85477 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Blue
85498 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin Green
85527 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Green
85528 nuie Deco 800mm Wall Hung Single Drawer Vanity & Laminate Top - Satin Green
86140 Hudson Reed Havana Wall Hung 2 Drawer Unit & Colour Match Worktop, 600mm - Graphite Grey
86163 Hudson Reed Havana Wall Hung 2 Drawer Unit & Colour Match Worktop, 600mm - Coastal Grey
86648 Hudson Reed Juno 600mm Wall Hung 2-Drawer Vanity & Worktop - Graphite Grey
86717 Hudson Reed Juno 600mm Wall Hung 2-Drawer Vanity & Worktop - Coastal Grey
89760 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Sparkling Black Worktop 600mm - Satin White
89761 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Sparkling White Worktop 600mm - Satin White
89775 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 800mm - Satin White
89811 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Bellato Grey Worktop 600mm - Satin Grey
89814 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 600mm - Satin Grey
89863 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Bellato Grey Worktop 600mm - Satin Blue
89866 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 600mm - Satin Blue
89935 Hudson Reed Urban 600mm Wall Hung 2-Drawer Unit and Laminate Top - Satin Green
90902 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 800mm - Satin Anthracite/Sparkle Black
90903 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 800mm - Satin Anthracite/Sparkle White
90981 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 800mm - Satin Grey/Sparkle Black
90982 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 800mm - Satin Grey/Sparkle White
91501 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Laminate Worktop, 600mm - Satin Anthracite/Bellato Grey