Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c35c82df78b204f24ddecf42c0ea9a8fae108c3e607d9d3005ca33100ceee4' 
  AND token = '5OZ2nzxbGCoZxLUcH5EbdRVMuXmWBHxG5RLo0hpx0WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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