SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8e9372b486fb05b1be4a7d179c379c2b367dc043d4335c897fce6ce5dddf0d17' 
  AND token = 'sW3qLRohpvv8+mmrsIMmV/1SF/UA52LvmCu3CKjSygU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00771

JSON explain

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