SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5a3756094b49b2067f1ad0332deb243836a8f8d668e709b3b9b752949d6ffd' 
  AND token = 'kzdYaLQ9MB9qs/7BicZWiHn5Qwtbe2jqKFJtX9zv4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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