SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268e06aa28fac9d7ba34b17653c6657eb8c6e0c333573847fcd52e2af29882c8' 
  AND token = 'IlVwZyqGYthS2ZEe+8jf+LMR+urHKWrQ1BuAgbIODwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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