Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27b54f81d688048bae236588357805271af191cd412e6938c8f85f0431226e0' 
  AND token = 'd0eV8BGv6oIDncX7npdXQsQVs5QWXbFdSEzSBYuqzfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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