Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478a8a60b5a79c6c2e97f27faa92c43ce0a80a48562bc423b993c6045c5d059a' 
  AND token = 'uutWp6rHiVJiqXAA4mW8satHiWbE2q2zc5pu2tKlCco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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