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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4df00b5c3d13d9889eb56a023b9352845d6004afc973799a834775b17618ba31' 
  AND token = 'QU+flFDuO5UH4ErZ1y18O1JmXbo8Wn0NcZvlf3QrVa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00746

JSON explain

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