SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e94110826eeec6859c8263380a4eff54fc871e34d8c5b89a815879b56dbd6c' 
  AND token = 'pWl1lkmPQBhkBJ77BxfoQq2XjOGvivzImL6ukpcb9Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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