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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522f4f475ec374b9955d9f7e14707826c82b8985b0983e17c63a435b42f84c4d' 
  AND token = '2ESm9dfMoxdVlmCh1DRMh6W6ko7QlJiiRrVa28e6po0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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