Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fddf37eb05f95b3950bbf0f7cddfeafa212c9391f74748c47cbfdbb3d21908a' 
  AND token = 'TbUPh1OImqcLt0jlHb3P83giRT08aF/XxyPb62rqokI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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