SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7426bd963c3ff565e734f1ba9b5e24f4aeeb4bccf4f3310d91d59a8aeb5983b3' 
  AND token = 'bjLwdbtH4KDu+/jIPGZaS4S0nLOlFsVz4Uu8xWlLJUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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