Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb531f1e9d7af25b9fb6a8741811f79ce48b5ab98d4c9eb5b25eb5ca400101d' 
  AND token = 'TVbTeIqaoEGDRYwq9Vr4S76AAEgzXLdoxP65slBp9Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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