Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997a2df9f77fef991a554b178468e6812fece3550ee8c5420ed7aecb0dedd447' 
  AND token = 'wy0Wb3UTuk4siFqFV4Nta6QwCX11Y4VLMU4Cq1cUO/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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