SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3fcb2c0d29dc14e85f9a379b6558b3e11d6e5fae2a9e8593403a09fcf3d12e' 
  AND token = 'GWET6Sqnuo0x4hIzHzJdjOj0ABiOPh8RVDev3wYsGn8=' 
  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"
    }
  }
}