Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233b29a416557f7d6bb3de55ceb25dc6df38c89ee5d2406c05d8f65e0a2d123a' 
  AND token = '/867wCbGPqqgUfRpJtnWCN9AUPHdmw9E49HOMqiL5Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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