Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba7be09b4a714563d7333dd483e4cf07e5bc0967b9fb3af3316c7e1afc1335' 
  AND token = 'y8RH6KwqtaIdyKnJT8THUOGK77NnOcqdOBTjhkJoowE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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