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 (
    82617, 82625, 82626, 83418, 83420, 83490, 
    83491, 86651, 86720, 87300, 87301, 
    89814, 89866, 89938, 91504, 82840, 
    82913, 82986, 83400, 83410, 86604, 
    86673, 82612, 83411, 88249, 85302, 
    85399, 85450, 85501, 83014, 83015, 
    83546, 83547, 90847, 90848, 90926, 
    90927, 90743, 90744, 90746, 90747, 
    90749, 90750, 90752, 90753, 84319, 
    84320, 85275
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00098

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 (82617,82625,82626,83418,83420,83490,83491,86651,86720,87300,87301,89814,89866,89938,91504,82840,82913,82986,83400,83410,86604,86673,82612,83411,88249,85302,85399,85450,85501,83014,83015,83546,83547,90847,90848,90926,90927,90743,90744,90746,90747,90749,90750,90752,90753,84319,84320,85275)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82612 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Gloss White
82617 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Curved Basin - Gloss White
82625 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Thin-Edge Basin - Gloss White
82626 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Curved Basin - Gloss White
82840 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Worktop - Solace Oak
82913 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Worktop - Anthracite
82986 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Worktop - Charcoal Black
83014 nuie Arno 500mm Floor Standing 2-Door Vanity & Thin-Edge Basin - Satin Green
83015 nuie Arno 500mm Floor Standing 2-Door Vanity & Curved Basin - Satin Green
83400 nuie Athena Wall Hung 2 Drawer Vanity With Worktop 600mm - Anthracite Woodgrain
83410 nuie Athena Wall Hung 2 Drawer Vanity With Worktop 600mm - Hacienda Black
83411 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 600mm - Gloss White
83418 nuie Athena Wall Hung 2 Drawer Vanity With Thin-Edge 1 Tap Hole Ceramic Basin 600mm - Gloss White
83420 nuie Athena Wall Hung 2 Drawer Vanity With Curved 1 Tap Hole Ceramic Basin 600mm - Gloss White
83490 nuie Athena Wall Hung Single Drawer Vanity With Thin-Edge 1 Tap Hole Ceramic Basin 800mm - Gloss White
83491 nuie Athena Wall Hung Single Drawer Vanity With Curved 1 Tap Hole Ceramic Basin 800mm - Gloss White
83546 nuie Athena Floor Standing 2 Door Vanity With Thin-Edge 1 Tap Hole Ceramic Basin 500mm - Gloss Grey
83547 nuie Athena Floor Standing 2 Door Vanity With Curved 1 Tap Hole Ceramic Basin 500mm - Gloss Grey
84319 Hudson Reed Fusion Floor Standing 2 Door Vanity Unit & Polymarble Basin 500mm - Gloss White
84320 Hudson Reed Fusion Floor Standing 2 Door Vanity Unit & Ceramic Basin 500mm - Gloss White
85275 nuie Deco 500mm Floor Standing 2-Door Vanity & Curved Basin - Satin White
85302 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Worktop - Satin Anthracite
85399 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Worktop - Satin Grey
85450 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Worktop - Satin Blue
85501 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Worktop - Satin Green
86604 Hudson Reed Juno 600mm Floor Standing 2-Door Vanity & Minimalist 1 Tap Hole Basin - Graphite Grey
86651 Hudson Reed Juno 800mm Wall Hung Single Drawer Vanity & Minimalist 1 Tap Hole Basin - Graphite Grey
86673 Hudson Reed Juno 600mm Floor Standing 2-Door Vanity & Minimalist 1 Tap Hole Basin - Coastal Grey
86720 Hudson Reed Juno 800mm Wall Hung Single Drawer Vanity & Minimalist 1 Tap Hole Basin - Coastal Grey
87300 nuie Lunar Wall Hung 1 Drawer Unit & Polymarble Basin, 600mm - Satin White
87301 nuie Lunar Wall Hung 1 Drawer Unit & Ceramic Basin, 600mm - Satin White
88249 Hudson Reed Havana Wall Hung 2 Door Tall Unit, 350mm - Autumn Oak
89814 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 600mm - Satin Grey
89866 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 600mm - Satin Blue
89938 Hudson Reed Urban 600mm Wall Hung 2-Drawer Unit and Worktop - Satin Green
90743 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 1 - Satin Anthracite
90744 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 2 - Satin Anthracite
90746 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 1 - Satin Grey
90747 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 2 - Satin Grey
90749 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 1 - Satin Blue
90750 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 2 - Satin Blue
90752 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 1 - Satin Green
90753 Nuie Deco 500mm Floor Standing 2 Door Vanity & Basin 2 - Satin Green
90847 nuie Arno Floor Standing 2 Door Vanity & Thin-Edge Ceramic Basin, 500mm - Satin Anthracite
90848 nuie Arno Floor Standing 2 Door Vanity & Curved Ceramic Basin, 500mm - Satin Anthracite
90926 nuie Arno Floor Standing 2 Door Vanity & Thin-Edge Ceramic Basin, 500mm - Satin Grey
90927 nuie Arno Floor Standing 2 Door Vanity & Curved Ceramic Basin, 500mm - Satin Grey
91504 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Laminate Worktop, 600mm - Satin Anthracite