SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab3e8c4378143ea49a6f8de5ac877c3c579bcef50f1d579ec2e6c6ff48679de' 
  AND token = 'whnUFfwvO1AFLiV5B+Zip3+53gtzZu0wLZyLxnFICUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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