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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f4a2469d8c86710b720b25f7a7f403af746bedae36db7b23b47d3d4a236d429f' 
  AND token = '33mBTVRbPoy3BBJhlz8ztDCJSfVQF9X436jqslcXh50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01604

JSON explain

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