Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5149d97b65fd07826adf00c2d0e4fb4d707982298438faa304a4f0655323c8d0' 
  AND token = '/he/9+zEPs5OgVkzha5DldR5KrvxrXc2HbcOrD4xkEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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