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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    22591, 22592, 22593, 22594, 22595, 22596, 
    22597, 22598, 22599, 22600, 22601, 
    22602, 22603, 22604, 22605, 22606
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00122

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "idx_product_lang"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (22591,22592,22593,22594,22595,22596,22597,22598,22599,22600,22601,22602,22603,22604,22605,22606) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description unit_name
22591 Cover - rear door outside handle, left<p>Part number 83652AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22592 Cover - rear door outside handle, right<p>Part number 83662AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22593 Opener Assembly - Fuel Filler Door<p>Part number 81560AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22594 Housing - Fuel Filler Door<p>Part number 81595AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22595 Panel assembly - fuel filler door<p>Part number 69511AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22596 Joint-Hose Drain<p>Part number 81686T6010</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22597 Panoramic roof assembly<p>Part number 81600AR010NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22598 Glass assembly - panoramic roof, rear<p>Part number 81640AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22599 Glass assembly - panoramic roof, front<p>Part number 81620AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22600 Motor assembly - panoramic roof (roller)<p>Part number 81679AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22601 Motor assembly - panoramic roof (glass)<p>Part number 81680AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22602 Roller Blind Assembly - Panoramic Roof<p>Part number 81670AR010NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22603 Hose assembly - drain front, right<p>Part number 816B0AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22604 Hose assembly - drain front, left<p>Part number 816A0AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22605 Hose assembly - sunroof drain, left<p>Part number 816C0AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22606 Hose assembly - sunroof drain, right<p>Part number 816D0AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>