Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebe6d3e2192bfb65b9abc0870a396b80e891eb178bf00c10c03196c118b7943' 
  AND token = '9rvnxKtx/CjGqQiLuQOLKIVO/XpmO/NIYU0bbSMEFEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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