SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cdd97fab7200a447267c32befe7d078213f04619a67be4fc8c3c5cd0fa18f5e6' 
  AND token = 'sX2VG8uRZNOJqvzUd4BL2RdOgHegZxpglrw9Kz4ab2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01453

JSON explain

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