Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b4a0e2275c33c6a13d75a16354e04625f7d5d87e5e8a7142232243de465309' 
  AND token = '16gX8gVYbkWTSN1erzfK0qiaEB8I1KyOyTtfmDUKZUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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