Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aa36fee1f97909659beceae674a2aca6a6587fd6d135663a4216e456d66601' 
  AND token = 'OO5gEOt5NX5LyK5d0zjMQ/RFE9MarzETqvCnfAc1k5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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