SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ab97256d5550ffcb9efa11804445c896a21af92276a93f59bf6d0a78da8146' 
  AND token = 'S8YIFQQ/+SP8pogc6JxpQ4qRm9vSATb6hEksV43KDzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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