Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7951becd1d8b3dfdeb2175410f1cdc973a0b46ca7d04cf825893d9bf0740d8' 
  AND token = 'RyrYs+zjjcdNpueZDj+Okm67Efvw/EZXCaxCyhWfqj8=' 
  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"
    }
  }
}