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 (
    84899, 86486, 86487, 86762, 86763, 84314, 
    88875, 88876, 88877, 88878, 88902, 
    88903, 82798, 82871, 82944, 83253, 
    83260, 84798, 84799, 86601, 86602, 
    86670, 86671, 91068, 85071, 85157, 
    85203, 85249, 82619, 82620, 83422, 
    83423, 89762, 83029, 83227, 83232, 
    83586, 84668, 84669, 84878, 90865, 
    90944, 85093, 85179, 85225, 85271, 
    82580, 82581
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00141

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "26.87"
    },
    "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": "22.07",
        "eval_cost": "4.80",
        "prefix_cost": "26.87",
        "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 (84899,86486,86487,86762,86763,84314,88875,88876,88877,88878,88902,88903,82798,82871,82944,83253,83260,84798,84799,86601,86602,86670,86671,91068,85071,85157,85203,85249,82619,82620,83422,83423,89762,83029,83227,83232,83586,84668,84669,84878,90865,90944,85093,85179,85225,85271,82580,82581)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82580 nuie Arno 600mm Floor Standing 2-Door Vanity & Thin-Edge Basin - Gloss White
82581 nuie Arno 600mm Floor Standing 2-Door Vanity & Curved Basin - Gloss White
82619 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Gloss White
82620 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Gloss White
82798 nuie Arno 600mm Floor Standing 2-Door Vanity & Minimalist Basin - Solace Oak
82871 nuie Arno 600mm Floor Standing 2-Door Vanity & Minimalist Basin - Anthracite
82944 nuie Arno 600mm Floor Standing 2-Door Vanity & Minimalist Basin - Charcoal Black
83029 nuie Arno 600mm Wall Hung 1-Drawer Vanity & Minimalist Basin - Satin Green
83227 nuie Athena Wall Hung 2 Drawer Vanity With Mid-Edge 1 Tap Hole Ceramic Basin 500mm - Gloss White
83232 nuie Athena Wall Hung 2 Drawer Vanity With Minimalist 1 Tap Hole Ceramic Basin 500mm - Gloss White
83253 nuie Athena Floor Standing 2 Door Vanity With Minimalist 1 Tap Hole Ceramic Basin 600mm - Anthracite Woodgrain
83260 nuie Athena Floor Standing 2 Door Vanity With Minimalist 1 Tap Hole Ceramic Basin 600mm - Hacienda Black
83422 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling Black Worktop 600mm - Gloss White
83423 nuie Athena Wall Hung 2 Drawer Vanity With Sparkling White Worktop 600mm - Gloss White
83586 nuie Athena Wall Hung Single Drawer Vanity With Minimalist 1 Tap Hole Ceramic Basin 600mm - Gloss Grey
84314 Hudson Reed Fusion Floor Standing WC Unit & Polymarble Top 600mm - Gloss White
84668 Hudson Reed Fusion Wall Hung 4 Door Vanity Unit & Polymarble Basin Compact 1200mm - Gloss Grey
84669 Hudson Reed Fusion Wall Hung 2 Door Vanity Unit & Ceramic Basin 600mm - Gloss Grey
84798 nuie Classique Floor Standing 2 Door Vanity Basin Unit & 1 Tap Hole Fireclay Basin, 500mm - Satin White
84799 nuie Classique Floor Standing 2 Door Vanity Basin Unit & 3 Tap Hole Fireclay Basin, 500mm - Satin White
84878 nuie Core Floor Standing 2 Door Vanity With Ceramic Basin 600mm - Gloss White
84899 nuie Core Floor Standing 2 Door Vanity Basin Unit & Ceramic Basin, 600mm - Satin Green
85071 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Anthracite
85093 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Worktop - Satin Anthracite
85157 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Grey
85179 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Worktop - Satin Grey
85203 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Blue
85225 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Worktop - Satin Blue
85249 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Minimalist Basin - Satin Green
85271 Hudson Reed Fluted 800mm Wall Hung Single Drawer Vanity and Worktop - Satin Green
86486 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Autumn Oak
86487 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Autumn Oak
86601 Hudson Reed Juno 500mm Floor Standing 2-Door Vanity & Thin-Edge 1 Tap Hole Basin - Graphite Grey
86602 Hudson Reed Juno 500mm Floor Standing 2-Door Vanity & Curved 1 Tap Hole Basin - Graphite Grey
86670 Hudson Reed Juno 500mm Floor Standing 2-Door Vanity & Thin-Edge 1 Tap Hole Basin - Coastal Grey
86671 Hudson Reed Juno 500mm Floor Standing 2-Door Vanity & Curved 1 Tap Hole Basin - Coastal Grey
86762 Hudson Reed Juno Wall Hung 1 Drawer Vanity Unit & Laminate Worktop, 600mm - Metallic Slate/Sparkle Black
86763 Hudson Reed Juno Wall Hung 1 Drawer Vanity Unit & Laminate Worktop, 600mm - Metallic Slate/Sparkle White
88875 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Polymarble Basin - Anthracite
88876 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Ceramic Basin - Anthracite
88877 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Polymarble Basin - Charcoal Black
88878 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Ceramic Basin - Charcoal Black
88902 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Polymarble Basin - Solace Oak
88903 nuie Arno Compact 600mm Floor Standing 2-Door Vanity & Ceramic Basin - Solace Oak
89762 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 600mm - Satin White
90865 nuie Arno Wall Hung 1 Drawer Vanity & Minimalist Ceramic Basin, 600mm - Satin Anthracite
90944 nuie Arno Wall Hung 1 Drawer Vanity & Minimalist Ceramic Basin, 600mm - Satin Grey
91068 nuie Classique Floor Standing 2 Door Unit & 0 Tap Hole Fireclay Basin, 500mm - Satin White