Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e71d768a690e38c2f94f1ec66d51f51573189c5bedf44f6451b9def7c6a37cc' 
  AND token = 'wtDnAPYaVlXFFX8qee9lbtxmh0piHWhVvSPDo/HB5Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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