Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8422b5b33f9608f150abf021502dd63c7dda7c39464026a8d3fc2b2041f75ee8' 
  AND token = '0Lr+9uey9OPiWj3jJPNGWDX+X6ctF2VtvbLEtn9n9d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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