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 (
    90871, 90872, 90950, 90951, 85116, 85117, 
    83573, 86485, 86654, 86723, 86761, 
    82628, 82629, 83493, 83494, 89748, 
    82618, 83421, 86624, 86625, 86693, 
    86694, 86519, 86795
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "12.97"
    },
    "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": 24,
      "rows_produced_per_join": 24,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "10.57",
        "eval_cost": "2.40",
        "prefix_cost": "12.97",
        "data_read_per_join": "91K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (90871,90872,90950,90951,85116,85117,83573,86485,86654,86723,86761,82628,82629,83493,83494,89748,82618,83421,86624,86625,86693,86694,86519,86795)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
82618 nuie Arno 600mm Wall Hung 2-Drawer Vanity & Laminate Top - Gloss White
82628 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Laminate Top - Gloss White
82629 nuie Arno 800mm Wall Hung 1-Drawer Vanity & Laminate Top - Gloss White
83421 nuie Athena Wall Hung 2 Drawer Vanity With Grey Worktop 600mm - Gloss White
83493 nuie Athena Wall Hung Single Drawer Vanity With Sparkling Black Worktop 800mm - Gloss White
83494 nuie Athena Wall Hung Single Drawer Vanity With Sparkling White Worktop 800mm - Gloss White
83573 nuie Athena Floor Standing 2 Door Vanity With Worktop 600mm - Gloss Grey
85116 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Laminate Top - Satin White
85117 Hudson Reed Fluted 600mm Wall Hung Single Drawer Vanity and Laminate Top - Satin White
86485 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Autumn Oak
86519 Hudson Reed Juno 800mm Wall Hung Single Drawer Vanity & Worktop - Autumn Oak
86624 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Graphite Grey
86625 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Graphite Grey
86654 Hudson Reed Juno 800mm Wall Hung Single Drawer Vanity & Laminate Top - Graphite Grey
86693 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Coastal Grey
86694 Hudson Reed Juno 600mm Wall Hung Single Drawer Vanity & Laminate Top - Coastal Grey
86723 Hudson Reed Juno 800mm Wall Hung Single Drawer Vanity & Laminate Top - Coastal Grey
86761 Hudson Reed Juno Wall Hung 1 Drawer Vanity Unit & Laminate Worktop, 600mm - Metallic Slate/Bellato Grey
86795 Hudson Reed Juno Wall Hung 1 Drawer Vanity Unit & Colour Match Worktop, 800mm - Metallic Slate
89748 Hudson Reed Urban Wall Hung 2 Drawer Vanity Unit with Worktop 500mm - Satin White
90871 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Anthracite/Sparkle Black
90872 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Anthracite/Sparkle White
90950 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Grey/Sparkle Black
90951 nuie Arno Wall Hung 1 Drawer Vanity & Laminate Worktop, 600mm - Satin Grey/Sparkle White