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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '00e0e39c7d1215263f1dbc3fee9fe2d35ef7bc031ac839339c7cfd10a79a8c21' 
  AND token = 'Zb7d+y7nxNeDz8MFpsV2sYjuFg+s3nPgTtEaeVRYsj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00936

JSON explain

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