Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1180fcff685af15385e8ded1efc1f7752f594b6c28b60f35cc8981f32738ad' 
  AND token = 'IPcuUy4Awqbkl2Anpk2z7WE1cOxahDKyi64xChj9AIQ=' 
  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"
    }
  }
}