Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4218b11348db63c95f40e6bc5b68ef18ca7a5aa767b7a361d95fd5c925551c' 
  AND token = 'KcE011GLNU9K5XAbWlaqNPABeNzKgswu4vlnKxvnVUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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