SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92d339907d4a877788bc8aee6c83adb0c938b12ef11e5206631fa2bafac0ac2' 
  AND token = 'jwzGCZWBOf4o2RtYzU/MGdC/jf88lVixJ4CZZEoor+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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