SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a486052b741a92d183f6395693f718fe7435b3dbe95162893154368b5d758b' 
  AND token = 'Yn69GXJLqos6j/z3JbP7446CGoxqcld8/3ZU+g3moSc=' 
  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"
    }
  }
}