Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6feb2fb830b2dba474ead8e27379e497dc490891d0c0ff122e2a13a23670f4e' 
  AND token = 'qg5VRzQZOdy9mesghxFEDZPSxwfwLzmmGM7PtlHggws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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