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 (
    82928, 82929, 83001, 83002, 83517, 83518, 
    83525, 83526, 83528, 83022, 83023, 
    90858, 90859, 90937, 90938, 83050, 
    83595, 84675, 84676, 90886, 90965, 
    84629, 84630, 85366, 85367, 89765, 
    84820, 84821, 91168, 86146
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00071

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 (82928,82929,83001,83002,83517,83518,83525,83526,83528,83022,83023,90858,90859,90937,90938,83050,83595,84675,84676,90886,90965,84629,84630,85366,85367,89765,84820,84821,91168,86146)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82928 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Anthracite
82929 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Anthracite
83001 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Charcoal Black
83002 nuie Arno 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Charcoal Black
83022 nuie Arno 800mm Floor Standing 2-Door Vanity & Thin-Edge Basin - Satin Green
83023 nuie Arno 800mm Floor Standing 2-Door Vanity & Curved Basin - Satin Green
83050 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Mid-Edge Basin - Satin Green
83517 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling Black Worktop 800mm - Anthracite Woodgrain
83518 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling White Worktop 800mm - Anthracite Woodgrain
83525 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling Black Worktop 800mm - Hacienda Black
83526 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling White Worktop 800mm - Hacienda Black
83528 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 800mm - Gloss White
83595 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 600mm - Gloss Grey
84629 Hudson Reed Fusion Floor Standing 2 Door Vanity Unit & Polymarble Basin 600mm - Gloss Grey
84630 Hudson Reed Fusion Floor Standing 2 Door Vanity Unit & Ceramic Basin 600mm - Gloss Grey
84675 Hudson Reed Fusion Wall Hung 2 Drawer Vanity Unit & Polymarble Basin 500mm - Gloss Grey
84676 Hudson Reed Fusion Wall Hung 2 Drawer Vanity Unit & Ceramic Basin 500mm - Gloss Grey
84820 nuie Classique Wall Hung 1 Drawer Vanity Basin Unit & 1 Tap Hole Fireclay Basin, 800mm - Satin White
84821 nuie Classique Wall Hung 1 Drawer Vanity Basin Unit & 3 Tap Hole Fireclay Basin, 800mm - Satin White
85366 nuie Deco 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin White
85367 nuie Deco 800mm Wall Hung 2-Drawer Vanity & Laminate Top - Satin White
86146 Hudson Reed Havana Wall Hung 2 Drawer Unit & Laminate Worktop, 800mm - Graphite Grey/Bellato Grey
89765 Hudson Reed Urban Floor Standing 2 Door 1 Drawer Vanity Unit with Minimalist Basin 800mm - Satin White
90858 nuie Arno Floor Standing 2 Door Vanity & Thin-Edge Ceramic Basin, 800mm - Satin Anthracite
90859 nuie Arno Floor Standing 2 Door Vanity & Curved Ceramic Basin, 800mm - Satin Anthracite
90886 nuie Arno Wall Hung 2 Drawer Vanity & Mid-Edge Ceramic Basin, 600mm - Satin Anthracite
90937 nuie Arno Floor Standing 2 Door Vanity & Thin-Edge Ceramic Basin, 800mm - Satin Grey
90938 nuie Arno Floor Standing 2 Door Vanity & Curved Ceramic Basin, 800mm - Satin Grey
90965 nuie Arno Wall Hung 2 Drawer Vanity & Mid-Edge Ceramic Basin, 600mm - Satin Grey
91168 nuie Classique Wall Hung 1 Drawer Unit & 0 Tap Hole Fireclay Basin, 800mm - Satin White