Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052c6422257939f14577d0446fa3a0b2a8ec0cbc75f09b74980f520f3dbe7793' 
  AND token = 'mMgovFpeRj9VvG21gP41A7W+ysU6dmvw0BZ7aaRLz7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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