Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b75e3ed2d678ffb7d3b5d109e16cc9a5bc7eb5e027aa555352206812023f92a' 
  AND token = 'YhdLI3639BMvKu7cix/mDLg9uEa17HW97imb/I4nn0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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