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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1c73d55907c14f34677537a938d5eb6d39af92e72bc0576897ddd3b2cd750ff0' 
  AND token = 'Ztx3OyoiB3MQyC+w4qNPvdCAKulM8bruHW2VStPJFp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00973

JSON explain

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