Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab53de46dffc178533672d74c3d8aa2802645710ffffebd1dff5e748348e4c2' 
  AND token = 'eZ5U2nkWq0Ni0F8/cAhjARCGKDBMRtjhqX9y95RQwqQ=' 
  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"
    }
  }
}