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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c1caa2668d0f5ade73e4306449f344ce9b7e52b91e94022c3e50cd7997b00d' 
  AND token = 'kfLZUp+2rQY+Ueq7Lkrb9SL7c0yKTRMdeaxXHY5kM+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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