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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0d32f0e0ecbe6908de2afba59d6378499aa6c555f72094aa47bc3c15519d20' 
  AND token = 'c4TToeDs42CSxvQHvDCplW4gCbaKoeVdf0lCO4DKsCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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