Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d5152302fa99db03efb177eab2e398f1418b9014bfb81511d150f0ed201bd8' 
  AND token = 'aFPnyO4vgHxYlS0UGf8Qvsx+6yd8hUxXcgvGXEkd6Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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