SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0561e9011dc3c6827d9bc7d1b3b5db47dc8af3e332b2a7410c34c0643bfa6ccb' 
  AND token = 'FB80SnmniC2bRPQOg3VnckkH+zeKzYj/VoGvkCprbGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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