Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1664c5e8e61dc67a455c5db7dc374dc482352c3accee6bb24cbd67afc973f8f' 
  AND token = 'lf16e3V5/cCYZ/6VcZuzr8OMkf2IEZhjd04DmDvrZlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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