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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a29af22cda25807baaf4848919a761b88ec5a9cc470fa2f0193bf47cfda5c4f4' 
  AND token = 'qEyv80Rq/YdjPjr/li/KAre4esAWWRYSl3eHuK9s1+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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