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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '05af466751e8b15946bd94cc4ad02a48e4464f2eacf5872a4acd278e44c51c41' 
  AND token = 'ZNQdumgjRyUJxByi+UNbESIbz7yy3KYraLCb9qrfbo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00781

JSON explain

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