Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6386ef5e7a00a93138bd5b24d29ec4707d51fc86a0375b30d7defa609fa1d34' 
  AND token = 'kqYmfB4UvzdLb1HzImK75GsI9XxFuX8qIPH2UNR9bo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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