Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac146282dd46814155075a9722766231799b8432c6b4747cc8c2ceb64afdfc5a' 
  AND token = 'a5zv3ett/mDmZdsj5R/bQvww8lYFSbu5nBnr8t3AxTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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