Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b942edf1207471760aa95999f8261d8897eb78bc5e86762cfc148e68b3b7948' 
  AND token = '5vJ0F7yhnkn7pryXuI9/m+JqszXxIfF2dUp7x794z68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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