Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6cce48c0e7c979c6c7dd36ac9411d2c03d622d95a29b4c5b6e62bd45faa65a' 
  AND token = '0l1w9B9RCGhimqzcetXCNzguXkMgMC7+La3tMTiQ5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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