SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041d27ba888d4619558dce9e99ceec86d3756caa1b376e35db7f4f3c421f6b93' 
  AND token = '7wX4c6UvtBvC9JJvEsNuKkQmHxeFg+J7PSvFZAn5Rfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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