SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98369914918459d9de5786f3de1f2bb949df74627899e3de66afe68d15769780' 
  AND token = 'V5KsfpmpO7sIoqOLoy2JAXvQH4XJQXS1xFjt/ICgNBU=' 
  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"
    }
  }
}