SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8c1f9607c6f55d9e55b9ebd0e5b6ec959276f458061a3b86712393f6e503c460' 
  AND token = 'ugp9ghuDsuJt728FiPCn+gPYvdSImYfylju7+YBjp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00953

JSON explain

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