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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dcb4dc56fe4ac6824c063a23a8e6f468c36e74eaf99b0fa529ecc79eb09b80e1' 
  AND token = 'yULw7rsqxCQdytYJyUdt+0QkvuVH1EB94rVOMha9ajI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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