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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '362cd09a748a1de778b14f56d8e03d56705d52750f1715ca3ca47bea90dfdf75' 
  AND token = '1MPQoeFMpEDzkM7u3Ixie4ph9gsohDrggO1Mgof66lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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