SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd5332684fa6a912df3546c11564bbd1bfc3d7f36ed276b216db7f68260fb1c' 
  AND token = 'FT30BHBuni9M7+gg0ahWm+7ni7G/OXpwX2ggI8MXjHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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