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

Query time 0.00356

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_companies",
      "access_type": "ALL",
      "rows": 2,
      "filtered": 100,
      "attached_condition": "(`_testcscart`.`cscart_companies`.`status` in ('A','P','N'))"
    }
  }
}