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 (
    89930, 90899, 90900, 90978, 90979, 91496, 
    85088, 85097, 85098, 85174, 85220, 
    85266, 83219, 83220, 83224, 83225, 
    85371, 85372, 85294, 85391, 85442, 
    85493, 91133, 91134, 91219, 91220, 
    91274, 91275, 85128, 85340, 89798, 
    89799, 89850, 89851, 89922, 89923, 
    91489, 91490, 83217, 83218, 83222, 
    83223, 85323, 85420, 85471, 85522, 
    89756, 89758
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00103

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 (89930,90899,90900,90978,90979,91496,85088,85097,85098,85174,85220,85266,83219,83220,83224,83225,85371,85372,85294,85391,85442,85493,91133,91134,91219,91220,91274,91275,85128,85340,89798,89799,89850,89851,89922,89923,91489,91490,83217,83218,83222,83223,85323,85420,85471,85522,89756,89758)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
83217 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 500mm - Anthracite Woodgrain
83218 nuie Athena Wall Hung 2 Drawer Vanity With Minimalist 1 Tap Hole Ceramic Basin 500mm - Anthracite Woodgrain
83219 nuie Athena Wall Hung 2 Drawer Vanity With Thin-Edge 1 Tap Hole Ceramic Basin 500mm - Anthracite Woodgrain
83220 nuie Athena Wall Hung 2 Drawer Vanity With Curved 1 Tap Hole Ceramic Basin 500mm - Anthracite Woodgrain
83222 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 500mm - Hacienda Black
83223 nuie Athena Wall Hung 2 Drawer Vanity With Minimalist 1 Tap Hole Ceramic Basin 500mm - Hacienda Black
83224 nuie Athena Wall Hung 2 Drawer Vanity With Thin-Edge 1 Tap Hole Ceramic Basin 500mm - Hacienda Black
83225 nuie Athena Wall Hung 2 Drawer Vanity With Curved 1 Tap Hole Ceramic Basin 500mm - Hacienda Black
85088 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Anthracite
85097 Hudson Reed Fluted 500mm Wall Hung 2-Drawer Vanity and Mid-Edge Basin - Satin White
85098 Hudson Reed Fluted 500mm Wall Hung 2-Drawer Vanity and Minimalist Basin - Satin White
85128 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin White
85174 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Grey
85220 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Blue
85266 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Green
85294 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Minimalist Basin - Satin Anthracite
85323 nuie Deco 800mm Wall Hung Single Drawer Vanity & Mid-Edge Basin - Satin Anthracite
85340 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Minimalist Basin - Satin White
85371 nuie Deco 800mm Wall Hung Single Drawer Vanity & Thin-Edge Basin - Satin White
85372 nuie Deco 800mm Wall Hung Single Drawer Vanity & Curved Basin - Satin White
85391 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Minimalist Basin - Satin Grey
85420 nuie Deco 800mm Wall Hung Single Drawer Vanity & Mid-Edge Basin - Satin Grey
85442 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Minimalist Basin - Satin Blue
85471 nuie Deco 800mm Wall Hung Single Drawer Vanity & Mid-Edge Basin - Satin Blue
85493 nuie Deco 600mm Wall Hung 2-Drawer Vanity & Minimalist Basin - Satin Green
85522 nuie Deco 800mm Wall Hung Single Drawer Vanity & Mid-Edge Basin - Satin Green
89756 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 600mm - Satin White
89758 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 600mm - Satin White
89798 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 500mm - Satin Grey
89799 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 500mm - Satin Grey
89850 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Thin-Edge Basin 500mm - Satin Blue
89851 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Curved Basin 500mm - Satin Blue
89922 Hudson Reed Urban 500mm Wall Hung 2-Drawer Unit and Thin-Edge Basin 1 Tap Hole - Satin Green
89923 Hudson Reed Urban 500mm Wall Hung 2-Drawer Unit and Curved Basin 1 Tap Hole - Satin Green
89930 Hudson Reed Urban 600mm Wall Hung 2-Drawer Unit and Minimalist Basin 1 Tap Hole - Satin Green
90899 nuie Arno Wall Hung 1 Drawer Vanity & Thin-Edge Ceramic Basin, 800mm - Satin Anthracite
90900 nuie Arno Wall Hung 1 Drawer Vanity & Curved Ceramic Basin, 800mm - Satin Anthracite
90978 nuie Arno Wall Hung 1 Drawer Vanity & Thin-Edge Ceramic Basin, 800mm - Satin Grey
90979 nuie Arno Wall Hung 1 Drawer Vanity & Curved Ceramic Basin, 800mm - Satin Grey
91133 nuie Classique Wall Hung 1 Drawer Unit & 1 Tap Hole Fireclay Basin, 800mm - Satin Anthracite
91134 nuie Classique Wall Hung 1 Drawer Unit & 3 Tap Hole Fireclay Basin, 800mm - Satin Anthracite
91219 nuie Classique Wall Hung 1 Drawer Unit & 1 Tap Hole Fireclay Basin, 800mm - Satin Grey
91220 nuie Classique Wall Hung 1 Drawer Unit & 3 Tap Hole Fireclay Basin, 800mm - Satin Grey
91274 nuie Classique Wall Hung 1 Drawer Unit & 1 Tap Hole Fireclay Basin, 800mm - Satin Green
91275 nuie Classique Wall Hung 1 Drawer Unit & 3 Tap Hole Fireclay Basin, 800mm - Satin Green
91489 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Thin-Edge Ceramic Basin, 500mm - Satin Anthracite
91490 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Curved Ceramic Basin, 500mm - Satin Anthracite
91496 Hudson Reed Urban Wall Hung 2 Drawer Vanity & Minimalist Ceramic Basin, 600mm - Satin Anthracite