SELECT 
  company_id, 
  secure_storefront 
FROM 
  cscart_companies 
WHERE 
  secure_storefront RLIKE '^(www[0-9]*.)?baubay.de'

Query time 0.00017

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_companies ALL 3 Using where

Result

company_id secure_storefront
1 www.baubay.de