Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815adefaee5c87d137de0fd91ca41fec9e1d8e5a0bb9f628cd7e6de0986f7c19' 
  AND token = 'IUUxm1czCWeOGGOAS8+wtzqWh1r320AeLsRIAjbfr0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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