SHOW COLUMNS 
FROM 
  cscart_shipments LIKE 'package_weight_g'

Query time 0.00036

Result

object(mysqli_result)#637 (5) {
  ["current_field"]=>
  int(0)
  ["field_count"]=>
  int(6)
  ["lengths"]=>
  NULL
  ["num_rows"]=>
  int(1)
  ["type"]=>
  int(0)
}