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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83828ad92cd935412668adfe8b7f68389a2f198d677cb166cee8f22cd191dfe0' 
  AND token = '2UYYOwcS0fxr7I3uso5pNliNE6Td30ObqRo/XVq1xmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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