Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb1dbf0dbdfcc384814c9aa1f8cc81690e94be12ec339f292a3e2e683aed96a' 
  AND token = 'cTT2rHMBjTfsedA0w+z6HJLDeaWur50snnc/b7Xbqsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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