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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e337b333f10990ace336a9ab9ef94387715cc0ca8492566d26ff1ce651c3d077' 
  AND token = 'B4L97bWbCTfD4phXAJ0et4Amcj2d6TJCOSv38QXDa1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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