Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd865c60b6849d175e55c7c35971c59474202f6cd17a95451d367c5dedcdbf348' 
  AND token = 'mnzNofGrap5dTKJi1hhd6FolOUZ9nlrn266DvflG2uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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