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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '92dfb36b891488a389d3f706900751d4639e88729e7dd504975868c673c7f76e' 
  AND token = 'Wrqf5mO+29P/xODXIEOYfEthGXgFy5lkL31xLavscGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00754

JSON explain

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