SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fd13306e2ebaeb15ef62ba95d57ff5efc6fc889fb9ca3a60da44b598efd17b' 
  AND token = 'z8YqOknfkAuHXd9LG/nWZwbxBSRS2UlBJ7FIYnB5bSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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