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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '13945ff8cf133e8de411f427a9af64a531fd4de0c21868884047fc5334717cf9' 
  AND token = 'HMrkCXRG7geOAVRBXKf5RckVIcLGqdbYyidtqTmz6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00791

JSON explain

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