Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c607f722a3c7079d01f1981365a41147b1441c33bcba2572c8a37ba80cfa7e6' 
  AND token = 'PlVXRncRpV5S6YobYbFCUeprKqel/KEqj9axXROJPc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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