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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb0084be5793c9662893a304852cbd692870d9f7e1714e49c4ada5e6a49aa9d' 
  AND token = 'ceXfuoqlocC8tpYfGRkq2fEiUpOTD+rufGZcUiS2nTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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