SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    12900, 12904, 12906, 12907, 12908, 12909, 
    12912, 12914, 12925, 12926, 12924, 
    12922, 12918, 12913, 12916, 12930, 
    12923, 12920, 12927, 12917
  )

Query time 0.00085

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (12900,12904,12906,12907,12908,12909,12912,12914,12925,12926,12924,12922,12918,12913,12916,12930,12923,12920,12927,12917)"
    }
  }
}