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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0fd3918850f50cb4ea72ae905086f2c915c1f039c96d25f1cf0f0bcfac93871e' 
  AND token = '1RfjSMrnfn3bgogCRc+Lu/ANxWtKEiiMyNsjE/6fHF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00816

JSON explain

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