Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcdb4e447e44444d3a5e782bd91b084b44744c25e62cbb9aca32d48c8d238d5' 
  AND token = 'kx715GW5UgPfLrrDWfaooDAsXIoY6PyHJcoJxACNeeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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