SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cf719c784fd6e3c06ae04afdabf5593797dcc5340069e6b95c5ce4677f21b5' 
  AND token = 'bB1HUPEtV+TZ/b4cyhXkhPOXsy5jGWThGCZJ04MMg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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