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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '84575b3498e077531e48fa6f6479367978c7c14ae2d7e0d05d4ae693a0ea6110' 
  AND token = 'HLaK7LuqTPNYRcUp/h06cXaEF7gOdbZ+TpKV3Q2YWno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01535

JSON explain

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