SELECT 
  company_id 
FROM 
  cscart_companies 
WHERE 
  1 
  AND status IN ('A', 'P', 'N')

Query time 0.00058

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_companies ALL 7 Using where

Result

company_id
1
5
6
7
8
12
13