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

Query time 0.01408

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0110178,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_companies",
          "access_type": "ALL",
          "loops": 1,
          "rows": 1,
          "cost": 0.0110178,
          "filtered": 100,
          "attached_condition": "cscart_companies.`status` in ('A','P','S','N')"
        }
      }
    ]
  }
}