SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfd7963ee7aa4e806930f6de64a04cfae5a0253bc724da1cb3cac2c488f7eed' 
  AND token = 'q7wVKabz/KV5ZQO1ojhyJzJjNrvLpCBdnhVmY/NX3K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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