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

Query time 0.00026

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
3 www.matbay.fr