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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0691935d1533e6409829d6fbe5f4fe9e9acfc792964b8c4b04eedcdc2c044ac' 
  AND token = '/fIjpjnXzF6M47XA0SvTsmj0bVFLa+Kc1PKf+T8vZnA=' 
  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"
    }
  }
}