Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18bcfb0e10c45e6357edb58c735f4f7e4e4bb8bd39c59f0bbc49e72ccd97dfa' 
  AND token = '0RG4JBWl4v7I3iOeP/ODGj2zX8A7Lei5GzBMYCXaRzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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