SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09dcaf6418b570399021ff1bedc8691a902343ff1b3f1a5d44b5f90472e431b' 
  AND token = 'twlRzVeLv3T+fe+/T6c2tDYjK1ypq1IZzYbzaa7qcJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}