Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a566da64e83927792e42495ebb55a248777b0b89b1c655f8c271246fedcef8aa' 
  AND token = 'CaJa7fjSMdBkldrDqWvSLJgoDdvp75MvDhzTMOLzPeE=' 
  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"
    }
  }
}