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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ab31be417847ea84b2578fcf0e8a4a03013a7bb368f4775e362dc4ea937a6d89' 
  AND token = '9nkKJjTrAEI9H6cZWakm993VTb3h84p73I80H56Lmbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00750

JSON explain

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