Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa032e71f93a5fdfd07d77763526072cc5191b368f39b18ef83c9aecebc2903' 
  AND token = '+dssvGhgrUS4tDyirq1KT5IckGZYGpMmWRS2d5ZOKxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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