Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31e076149877a3e4be9998bcd64395d3d34afb4b2d7441e7255794388939349' 
  AND token = 'a6eFMeYTjpS+wDNOgLZfqNY3DYf2+H3MFeqo/yDjnJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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