SELECT 
  company_id, 
  storefront 
FROM 
  cscart_companies 
WHERE 
  storefront RLIKE '^(www[0-9]*.)?fish.ee'

Query time 0.00017

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_companies system 1

Result

company_id storefront
1 fish.ee