Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51126a45dc46364425db119531e3585ecb6c083697efde69c6b82067849a6083' 
  AND token = 'i3GgLbGfCOkBMQq4W5GUHgdEqMHXZH/LAg2mg/Cz2P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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