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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '573ca8ea22e4a6b8b939668143507338a8dc14571328938f1659f5ce80098811' 
  AND token = 'aMCp2B5QPd0Nx6SUjqpkCeYpcVu00WmISUpiLxLoCrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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