Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23b5e93aca4a4f4267ba5e0024b4c02d80a033bc42546ea4255c1cc96c989f4' 
  AND token = 'bVRMK3x5IM1QGuhPOiKb4rMnd+D1KIopFzrIFVcV5p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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