Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721a2a960b486c06d9b1e64bced6ff069b3583b37194ac9e1c5fdaed8b5877a9' 
  AND token = 'TZkG3jM1mhNOmoKSGxbWdCCXs6KaPQkJUsiFbN4U6fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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