Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91c60c3e59140853e32cd1029bcdb30fc3ecb11b6748548ca32fb4e3df32336' 
  AND token = 'erXO4Awjw/zvIgIUn3i/NgD/+WLHnhSleNjEoRdM4mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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