Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8f19cd280592fb78c83b58fbca01aaa443ee4ce08c9b8a2661415e7a7a43a0' 
  AND token = 'NuDpbddEQSjVnVDXEykksQUMBBBRs/jrrD0rL0Rw+XM=' 
  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"
    }
  }
}