Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900fb40d5ebafdfffa98ada7c3a336a2ea8d330d9fa76c1024ff6174036cac3d' 
  AND token = 'K8x+Z5UUS1whmh/M6ukZRmHyQPoVMn0n0gD6hU4tg+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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