SELECT 
  COUNT(*) 
FROM 
  cscart_access_restriction 
WHERE 
  type = 'd' 
  AND status = 'A'

Query time 0.00006

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_access_restriction",
      "access_type": "ref",
      "possible_keys": ["type"],
      "key": "type",
      "key_length": "9",
      "used_key_parts": ["type"],
      "ref": ["const"],
      "rows": 1,
      "filtered": 100,
      "index_condition": "cscart_access_restriction.`type` = 'd'",
      "attached_condition": "cscart_access_restriction.`status` = 'A'"
    }
  }
}