SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    64865, 64867, 64945, 64907, 64738, 64900, 
    64948, 65703, 60748, 63034, 64789, 
    64905
  )

Query time 0.00064

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": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (64865,64867,64945,64907,64738,64900,64948,65703,60748,63034,64789,64905)"
    }
  }
}

Result