SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c607fb8cf5397542aa19697611a03a5ca7de3b8f4e2fa6515265ba94d44826' 
  AND token = 'fw4PUk20v+JKWRBnnHe61WgbNe/zwB3h8Tm1URtEGPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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