Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a603aaa17716a1e39a9665490f48237441f1b9a2e8c4884a3bb30ef9550bb2' 
  AND token = 'NZPbnYHARMM+6cYUPJ6Mq7e/tJioZsl2v+AI7W2TW6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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