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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '736d4de196bb40e1b7a99720febbd5d4474e37a8b93e264509d73a6f1700aafe' 
  AND token = 'KYYhGhj2D9aq88IN4ubjCxcEJNKuzqCrPBic2VXSWd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00764

JSON explain

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