Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39503028706dc1c7c5adbb43c847c3e5a500c187cf41d67d130526279800648' 
  AND token = 'KSnQzdQlmtf85/74eb7s7aMp/VMxXlkha6uQZbItq2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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