Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac39f53cb985ca6bbf2835f13e487fb3eecb727387abeab7c448cea0b1c989c7' 
  AND token = 'jy/WBHQZrfy7WubfnipwttXnXtSHreov7U7yQj5KVhw=' 
  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"
    }
  }
}