Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e99145135ebc807e828f329080940aa58db3fa8858f48a94abfac613df026f3' 
  AND token = '5LxcT/rrNG1HIoEmOrQSdMTSoPlYCAsgaciWoz6XFHk=' 
  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"
    }
  }
}