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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '209852b7ec9660a6f533983d8b7eac7184224a7b149718a6146a493754f12ea1' 
  AND token = 'IYw33sjg131+Gd2hsrR4dm2oK9a5iAff7I2Yu+FMaJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00749

JSON explain

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