SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f98fb9e88ddec85b96668164b9af33232651fd5e48566a9414ce1592ab80b11' 
  AND token = 'tgFdqgNkVSu2V4lGbdS+KwhevtszUz1tVQpC0bm2/mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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