SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8365d29f6b01a2d9de0793fc693706ad9f7258f57933dd69450d4153fb2be0' 
  AND token = 'XezJFIWmGMmvJl7tSNSqbKvdf3gN6V/v7OTyzj8ZBLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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