Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'efee7d9f640a3c91482c4b1cec88366621ed6655f88190486f1df760ac15943a' 
  AND token = 'MTWH8wLrkNuz74csUomjuOuw8z7/k4+F2o5Pnr9F/IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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