SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a534fe3bf0fc1c8847fb7c065b22a5cc536c37b45892ca9bc4fa101301cbcbc9' 
  AND token = 'YeAwkivj0gNNVTyFBIWOiWm++EnwwKsGlRju+w/JCXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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