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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c97687bde3cae12137a81c68c61272d10ecae6f5d67c58d721b32355896c2321' 
  AND token = '/kbvcLzDswYeEMbqGbqk7ftqHGL1Xdc3e2LL6mTT6AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00780

JSON explain

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