Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dd337f21d143bb2c429859114fab67befbf4f0d823c5dfdbb82c5038de4d48' 
  AND token = 'xb6kfoN9Zan6ra8vklZflIMOpQLOgVWyv1055Y/crtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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